/Engine/Plugins/Runtime/GeometryCache/Source/GeometryCache/Classes/GeometryCacheStreamingManagerBase.h
Gets a pointer to a chunk of cahed geometry data
Either the desired chunk or NULL if it's not loaded
const uint8 * GetLoadedChunk ( const [UGeometryCacheTrackStreamable](API\Plugins\GeometryCache\UGeometryCacheTrackStreamable) * Track, uint32 ChunkIndex, uint32 * OutChunkSize ) const